PDF documents are blank but epub documents are not

Hello All;
I have an install of ACS 4. Installed on the following.
Linux version 2.6.28.1-xxxx-std-ipv4-32 ([email protected]) (gcc version 4.3.2 (Debian 4.3.2-1) ) #2 SMP Fri Jan 30 09:55:02 UTC 2009
I have a production license and I am able to fulfill books - both epub and PDF.
However, when I attempt to download/view the books in Adobe Digital Editions, the PDF files are blank. I should mention that the PDF files that are blank, are PDFs that I grabbed from public domain sites (archive.org). The epub documents that I grabbed from the same source, work find in Adobe Digital Editions.
I would also add that the sample books that are included with Adobe Content Server work just fine. So, I am to assume that there is something 'wrong' with the PDFs that I have.
Anyone see this before? Anyone know where I could look for answers?
Thanks much.
Glen

Digital Editions supports essentially the PDF/A profile (plus some extras see the FAQ at http://www.adobe.com/products/digitaleditions/faq/ for the full list).   The most commonly noticed thing that is missing compared to the current PDF 1.7 spec is JPEG2000 support.
What happens when you view these files in Digital Editions before your package them?

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